Calendar.



F. X. MOERK.

CALENDAR.

APPLICATION HLED 1AN.18. i916.

3 SHEETS-SHEET l.

Patented Apr. 17, 1917.

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Afro/WIK F.' X. MOERK.

CALENDAR.

APPLICATION FILED JANJB, 1916.

Patented Apr. 17, 1917.

3 SHEETS-SHEET 2.

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Patented Apr. 17, 1917 3 SHEETS-SHEET 3.

P. XJMOERK. CALENDAR. `APPLICATION fILED JAN. I8, |9|6.

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UNITED sTATEs PATENT s oEEicE.

FRANK X. MOERK, OF OAK LANE, PENNSYLVANIA.

CALENDAR.

To all whom t may concern:

Be' it known that I. FRANK X. Noemi, a citizen of the United States. residing at Oak Lane. county of Philadelphia. and State ot Pennsylvania, have invented a. new and usefulllrnprovement in Calendars. ot which the. following vis a full. clear. and exact de- `scription, reference 'being had to the accompanying drawings` which forni a part of this specification.

My invention relates to the class ot deof the months to the fixed regular forms olthe days ot the week. as to produce a readable calendar which shall be correct in said relation for any year. common as well as 1e/ap.

My calendar is ot' simple form and to eft'ect the shitting retina-ed to requires no complicated parts nor ahstruse calculations. Tt consists 'of but two parts. slidable the one within the other. the innerone hearing the numerals representing the days oty thev months. and the envelopingones each bearing the words representing the days of the week for the twelve months andalso the numerals representing the years for which the'calendar may be use d. rl`heseope ot the calendar is only limited by the number of years appearing thereon, which ma y, for eX- ample, be. 300 years; as in the particular example ot the caleinlarwhich l will now proceed to describe, in connection with the accompanying d1a\\'ings.- iu which- Figure 1 represents a face view of my calendar.r usable for common years only.

Fig. 2 represents a rear view ot same. usable ior leap7 years only. and shown as `set correctly forV the present year with Fig. 3 represents one face ot' the interior sliding member by itself.V

As before stated. the structure ot lmy calendar is very simple, consisting in the present instance ot three sheets of cardboard. Sheet A, forming the front factaand sheet TB forming the rear face, are/bound together Specification of Letters Patent.

Application Ied January 18, 1916. Serial No. 72,669.- i

within the envelop formed by the structure described., and is slidable therein.

Sheet C is of sutiicient length to reach from end to end of the interior of said envelop, but its height is less than the height et the envelop. Thus the before mentioned spacing .strips atthe ends form a guideway between which-sheet C is slidable up and down a certain distance limited by the spacing strips at top and bottom.

'There is av slot e in the middle of sheet A. providing an opening in which a small col.- lapsible handle f attached to sheet C, may be utilized to slide sheet C up and down in the envelop.

AThe front tace of the calendar is designed to be used forconnnon years and the rear taee for leap years and they are similar in form. The small handle f. which is ar ranged to fold back into slot c to preserve a flat. thin forni for mailing. may be attached on either front or back side, or both. as desired.

Both sheets A and B are provided With twelve rectangular openings f7 arranged in two rows of six each. one row being above the central slot and the second row below said slot. and each opening is headed with the name ot a month. in order.'t1om Jannary to December` on each t'aee. l

Down the edges o'tl the openings. on the strips of sheets A. and B forming the sides thereof. are arranged the days ot the week als` representing the days ot the month ap- Ypear in calendar form in each of the twelve openings in both faces of theralendar. and in order to explain how they are adjusted to suit various years, we will take a certain single month as an example. say the month of January, as shown on Fig. 1.

Here it is seen the numerals are 31 in number, as is correct for January, and 1 is a Saturday, and appears at the bottom of the second column as visible in theopening.

5 Now it is readily seen that in order to arrange for any and allyears, provision mustbe made for 1 to appear opposite any one of the days in the week, that is, it must be posible to have 1 appear in six other lines opposite lo thc other six days of the week.

The form h is continued down on sheet C below the part visible in Fig. 1, a distance of six more horizontal rows of the form, which rows contain numerals arranged consecutively down the column, the numerals in succeeding columns" being greater by seven than the numerals in the column p it. By moving sheet C upward, as provi for, from the lowest position shown in the drawing, the first day of January may be made tocome in line with any day of the Week desired, and in any of the seven positions it may assume there will be visible 31 consecutive numbers in the January opening properly arranged in calendar form.

The numerals in the next month are arranged to begin on the horizontal line followin 4 that upon which the final numeral of the anuary days appear. Thus, in the 39 figure, the last day of January 31 is a Monclay. Therefore the February numerals are made to start with 1 on the Tuesday line. This beingr the common year side of the calendar, the February numerals end with QS, which is seen to be in the Monday line. Therefore the March numerals begin with 1 on the Tuesday line. Here we again have 31 days. ending in the Thursday line, so the April numerals begin with 1 on the Friday 40 line. Thus one mouth succeeds another throughout the twelve, as visible through the twelve openings In each case, the form on sheet C, for each opening, extends six lines farther down. These show through said opening, as described for the month of January.

Thus it is seen that if the irs't day of January is made to occur onthe correct day of the week for any certain year, by moving` sheet C as described, the' whole years calendar is at once arranged, the days and months following each other in sequence and without gap, as they should. This is, of

course. for the common year. If the ear 5T) desired is a leap year, the opposite si e of the calendar should be used, which is arranged exactly the same as the front side with the exception that 29 days appear in February instead of the 28 shown on the front face.

It only remains now to indicate at which of the seven possible positions to place sheet C in order that January 1 shall come on the correct day 'of the week for any certain year. To do this I have arranged the num- 1,2aa,ese

bersofntheymfwhich f man is intended to be used, upon sheet, in the fo way.

On sheet C, have placedanndicatmg markinearhandle{,eothatsaldmarkml,o visible in any position of sheet C from the top to the bottom of its movement. Inalmuch as this moyemmt covers seven stated positions, I have arranged a table conaiding of horizontal lines on each side of alot e, .,6 uponfrontdieet provi forahorizontalrowofyearamlinewi eachofthe seven stated positions.

fTo the left pfalllot e appear when o past ears 1904 going as far as desired-in this case 150 years-to the year 1758. Similarly, to the right of slot e appear the numbers of the ears after 1904 for a similar period in the tune-beginning with 1905 and running u to 2056. u

These year numbers are arra consecutively, so it is-a simple matter to find any veardeairedgaudthe aresoarrangedin the horizontal table t when sheet C is moved until the indicating mark thereon ,o comes in line with the number of the year desired, the calendar will be set correctly for that year.

In this table of years, the numbers of all the years occur, but as the front face of the g5 calendar is only correct for common years,

I have designated the leap years appearing in this table in some special way, such- 'as underscoring, as daown in the drawing;

or the may be printed in red, or otherwise, 10 to di erentiate them.

On the rear face of the calendar appears a year table similar to the one on the front face, except that here the numbers of leap vears only occur, as this side is correct only for leap years. .As this requires only Y about one quarter the space of the front year table. I have utilized the remaini space, on sheet B, by adding a very simp tablefor finding Easter day in any of the years for which the calendar may be set.

This Easter table is arranged as,follows: Headin the table is the statement ;Easter is the unday next after the given date in March or April. Below this appear the 116 numbers of all the years for which the front face of the calendar was arranged-in this case all the years from 1758 to 20M-arranged .in consecutive order, in'rows and columns. Each column contains eight year 12o numbers. and below them contains a ydate A either in March or A ril. To 6nd when Easter occurred or l occur in a certain year, dtd let the lendar for that year. Then locatethe rnumberintheEaerlzt table and note date in March or A 'l belowit. Lookingupthisdateontheea darasaet,weeanreadoltl\edateofthe Sunday following it as that upon which Easter fell or will fall that year. lso

For instance, suppose we wish to know when Easter will fall in the year 1916. VlitliA the front face of the calendar before us, we lirst grasp the little handle and move sheet C untilthe indicating black mark is in line with 1916, as shown. It is seen that this year is underscored and is therefore a leap year, so the calendar is turned over and upon the other side appears the calendar correctly set to use for the year 1916. It will be noticed that the indicating black mark in the slot c on this side of the calendar is also in line with the number of the leap years. Therefore, if the year number is recognized at once as a leap year, the

calendar may be set at once from this side and tlirv front face need not be used. Swing set the calendar as described, we look for 1916 among the year numbers in the.k Easter table, and nd it in the top row, tofthe rightk Beneath it, at the bottom of its cohlnmmappears the date April 17. After locating tliisdate on the calendar before us, /we seevvit' comes on Monday, and therefore ,245 i Ester/falls upon the following Sunday, or

y langage of April.

tam aware that in perpetual calendars etsof twelve numbers each containing thir- /i/fteen rows of figures have been mounted to slide relatively to a card dprovided with cutaway portions correspon ing to the months of the year. I am also aware that it is old, in perpetual calendars, to provide a sliding sheet between two other sliding sheets. I do 'not, therefore, claim these features as my 'inventioinbut claim only a construction, 4as is defined in the claims, wherein such features 'are incorporated with other features and arranged in such a way that by a simple 40 single slidlngmovement, a com lete and correct calendar for any year, common or leap, will be alforded, without necessitatving any computations and presenting the appearance of a calendar specially designed or suchyear. v Having now fully` described my invention, what I desire to protect by Letters Patent 1s: f 1. A. calendar comprising two main sheets forming the front and rear faces of the calendar and. each provided with cut-awav Dortions corresponding to the twelve months of f -the year,'seven rows of spaces on the front face corresponding tothe seven days of the week and provided with consecutively arranged common year and leap year numerals, a slidable sheet arranged between the main sheets' and provided'n'each side with a group of twelve sets of numerals corresponding to the twelve months of the year, each set of numerals having thirteen rows, the two groups of numerals being identical except for the provision of an additional numeral on the rear face inthe set corresponding to the month of February, and a device on the front face of the intermediate 1sliding' sheet adapted to be alined with. any

one of the seven rows-of year numeral spaces on the front sheet, whereby the calendar may be adjusted from the front for either common years or leap ears.

2. A calendar comprlsing two main sheets forming the front and rear faces of the calendar and each provided with cut-away portions corresponding to the twelve months of 76 the year, seven rows of'spaces on the front face corresponding to the seven days of the week, said face provided with year numerals, a slidable sheet arranged between the. main sheets and provided on each side with 80 a group of twelve sets of numerals corresponding to the twelve months of the year, each set lof numerals having thirteen rows, Y. the two groups of numerals being identical vexcept for the provision of' an additional SI5 numeral on the rear face in the set corresponding to the month of February, seven rows of spaces on the rear' face corresponding with the seven rows'of aces on the front face, said rear face provi ed with year numerals, and spaces on the rear face provided with month and 'day numerals arranged .in line with transversely alining numerals of the seven rows and lndicatin dates for the determination of movable hohdays in the years represented by such transversely alinmg numerals.

In testimony of whi h invention, -I have hereunto set my hand, at Philada., Penna., on this 14th day of January, V1916. f 

